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https://www.readbyqxmd.com/read/29331896/environmentally-available-hexavalent-chromium-in-soils-and-sediments-impacted-by-dispersed-fly-ash-in-sarigkiol-basin-northern-greece
#1
Nerantzis Kazakis, Nikolaos Kantiranis, Kyriaki Kalaitzidou, Efthimia Kaprara, Manassis Mitrakas, Robert Frei, George Vargemezis, Dimitrios Vogiatzis, Anastasios Zouboulis, Anestis Filippidis
Hexavalent chromium is one of the most toxic and carcinogenic species known and can be released into the environment from several sources. In Sarigkiol basin (N Greece) the presence of Cr(VI) in soil, sediments and groundwater may originate from both natural (ophiolitic rocks and their weathering products) and anthropogenic (dispersed fly ash produced from lignite power plants) sources. In this study, the distribution of contents and origin of environmentally available Cr(VI) in soils, sediments, regoliths and fly ash of Sarigkiol basin is presented...
January 11, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29327318/evaluation-of-water-quality-and-human-risk-assessment-due-to-heavy-metals-in-groundwater-around-muledane-area-of-vhembe-district-limpopo-province-south-africa
#2
Joshua Nosa Edokpayi, Abimbola Motunrayo Enitan, Ntwanano Mutileni, John Ogony Odiyo
Groundwater is considered as good alternative to potable water because of its low turbidity and perceived low contamination. The study assessed the physio-chemical and heavy metals concentrations in eight randomly selected boreholes water at Muledane village in Limpopo Province of South Africa and the results were compared with South African National standard permissible limit. The impacts of heavy metals on human health was further determined by performing quantitative risk assessment through ingestion and dermal adsorption of heavy metals separately for adults and children in order to estimate the magnitude of heavy metals in the borehole samples...
January 12, 2018: Chemistry Central Journal
https://www.readbyqxmd.com/read/29321978/toxicity-of-formulants-and-heavy-metals-in-glyphosate-based-herbicides-and-other-pesticides
#3
N Defarge, J Spiroux de Vendômois, G E Séralini
The major pesticides of the world are glyphosate-based herbicides (GBH), and their toxicity is highly debated. To understand their mode of action, the comparative herbicidal and toxicological effects of glyphosate (G) alone and 14 of its formulations were studied in this work, as a model for pesticides. GBH are mixtures of water, with commonly 36-48% G claimed as the active principle. As with other pesticides, 10-20% of GBH consist of chemical formulants. We previously identified these by mass spectrometry and found them to be mainly families of petroleum-based oxidized molecules, such as POEA, and other contaminants...
2018: Toxicology Reports
https://www.readbyqxmd.com/read/29320235/a-limited-survey-of-metal-content-in-blue-jack-mackerel-trachurus-picturatus-obtained-from-markets-in-the-canary-islands
#4
Carmen Rubio, Laura Acosta, Gara Luis-González, Dailos González-Weller, Consuelo Revert, Arturo Hardisson, Ángel Gutiérrez
The levels of 20 metals (aluminum, boron, barium, calcium, cadmium, cobalt, chromium, copper, iron, potassium, lithium, magnesium, manganese, molybdenum, sodium, nickel, lead, strontium, vanadium, and zinc) were analyzed in muscle and liver tissue of Trachurus picturatus marketed in the Canary Islands (Spain) by using inductively coupled plasma optical emission spectrometry. In the liver samples, the mean concentrations in milligrams per kilogram wet weight (wt) of Al (14.7), B (0.99), Ba (1.64), Ca (314), Cd (2...
January 10, 2018: Journal of Food Protection
https://www.readbyqxmd.com/read/29289671/melatonin-protects-mouse-spermatogonial-stem-cells-against-hexavalent-chromium-induced-apoptosis-and-epigenetic-histone-modification
#5
Yinghua Lv, Pengfei Zhang, Jiayin Guo, Zhendong Zhu, Xueliang Li, Dazhong Xu, Wenxian Zeng
Given the potential biological functions of spermatogonial stem cells (SSCs) in spermatogenesis and in delivering parental genetic information to the next generation, how these cells respond to environmental toxins and carcinogens should be investigated. We examined the toxic effect of hexavalent chromium (Cr(VI)) on global histone modifications and apoptotic signaling pathways in SSCs. We determined the effect of melatonin, one of the most powerful endogenous free radical scavengers and wide-spectrum antioxidants, in protecting SSCs from Cr(VI)-induced apoptosis and global histone modification by Western blot analysis...
December 28, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/29288979/in-vitro-genotoxic-effect-of-secondary-minerals-crystallized-in-rocks-from-coal-mine-drainage
#6
Adriane Perachi Nordin, Juliana da Silva, Claudia Telles de Souza, Liana A B Niekraszewicz, Johnny Ferraz Dias, Kátia da Boit, Marcos L S Oliveira, Ivana Grivicich, Ana Letícia Hilario Garcia, Luis Felipe Silva Oliveira, Fernanda Rabaioli da Silva
Coal processing generates a large volume of waste that can damage human health and the environment. Often these wastes produce acid drainage in which several minerals are crystallized (evaporites). This study aimed to identify secondary minerals, as well as the genotoxic potential of these materials. The samples were collected at two sites along the Rocinha River in Santa Catarina state (Brazil): (1) directly from the source of the acid drainage (evaporite 1), and (2) on the river bank (evaporite 2). The samples were characterized by X-ray diffraction and by particle-induced X-ray emission techniques...
December 16, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29287336/toxic-metal-levels-in-cocoa-powder-and-chocolate-by-icp-ms-method-after-microwave-assisted-digestion
#7
Gianluigi Maria Lo Dico, Fabio Galvano, Giacomo Dugo, Carlo D'ascenzi, Andrea Macaluso, Antonio Vella, Giuseppe Giangrosso, Gaetano Cammilleri, Vincenzo Ferrantelli
The Commission Regulation (EC) Regulation N. 488/2014, established the concentration limits for cadmium in specific products based on cocoa and chocolate products as from January 2019. Based on this information there is a need to determine ultratrace levels of elements that might be presents in cocoa and chocolate products. In this work, the concentrations of Arsenic, Antimony, Cadmium, Chromium, Lead, Selenium and Vanadium were evaluated in cocoa powder and chocolate by the validation of an ICP-MS method. Good selectivity/specificity, recovery, repeatability and within-laboratory reproducibility, LOD, LOQ, range of linearity, standard measurement uncertainty parameters for method validation were achieved, in accordance with Commission Regulation...
April 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29279993/influence-of-varying-water-quality-parameters-on-the-acute-toxicity-of-silver-to-the-freshwater-cladoceran-ceriodaphnia-dubia
#8
Rami B Naddy, William A Stubblefield, Russell A Bell, Kuen B Wu, Robert C Santore, Paul R Paquin
The acute toxicity of silver to Ceriodaphnia dubia was investigated in laboratory reconstituted waters as well as in natural waters and reconstituted waters with natural organic matter. The water quality characteristics of the laboratory reconstituted waters were systematically varied. The parameters that demonstrated an ability to mitigate the acute toxic effects of silver were chloride, sodium, organic carbon, and chromium reducible sulfide. Factors that did not have a consistent effect on the acute toxicity of silver to C...
December 26, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29275249/sns2-sno2-heterostructured-nanosheet-arrays-grown-on-carbon-cloth-for-efficient-photocatalytic-reduction-of-cr-vi
#9
Guping Zhang, Dongyun Chen, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu
Nowadays, among the many heavy metal pollutants, hexavalent chromium (Cr(VI)) seriously threatens ecological systems and human health due to its high solubility, acute toxicity and potential carcinogenicity in wastewater. Meanwhile, semiconductor photocatalytic reduction is continuously gaining increasing significant research attention in the treatment of Cr(VI). Hence, we report an efficient preparation method for SnS2/SnO2 composites on carbon cloth (CC), for efficient photocatalytic reduction of aqueous Cr(VI)...
December 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29249026/efficiency-of-biogas-slurry-and-burkholderia-phytofirmans-psjn-to-improve-growth-physiology-and-antioxidant-activity-of-brassica-napus-l-in-chromium-contaminated-soil
#10
Muhammad Nafees, Shafaqat Ali, Muhammad Naveed, Muhammad Rizwan
Contamination of soil is a major problem globally with colligated danger for ecosystem and human health. Chromium (Cr) is a toxic heavy metal and caused harmful effect on growth and development of plants. Phytostabilization reduced the mobility of heavy metals with addition of amendments which can significantly decrease metal solubility in soil. Phytostabilization can be achieved by application of biogas slurry (BGS) and endophytic bacteria as amendments in the contaminated soils. The present study revealed that the Burkholderia phytofirmans PsJN and BGS improved the growth, physiology, and antioxidant activity and reduced Cr uptake under a pot experiment spiked with Cr (20 mg kg-1 soil)...
December 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29236159/rapid-detection-of-sublethal-toxicity-using-locomotor-activity-of-rainbow-trout-juveniles
#11
Tomas Makaras, Gintaras Svecevičius, Nijolė Kazlauskienė, Danguolė Montvydienė
This study examined changes in locomotor activity of the rainbow trout (Oncorhynchus mykiss) juveniles exposed to sublethal concentrations of hexavalent chromium (Cr6+) (as a single pollutant) and landfill leachate (as an complex mixture of mainly organic compounds, including trace amounts of metals). Fish were first examined for baseline behavior patterns for 3 h to determine the appropriate duration of acclimation and the control level. The average velocity of fish was found to be the most informative among other endpoints throughout the 3 h long acclimation...
December 13, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29223115/immobilization-of-hexavalent-chromium-in-contaminated-soils-using-biochar-supported-nanoscale-iron-sulfide-composite
#12
Honghong Lyu, Hang Zhao, Jingchun Tang, Yanyan Gong, Yao Huang, Qihang Wu, Bin Gao
Biochar supported carboxymethyl cellulose (CMC)-stabilized nanoscale iron sulfide (FeS) composite (CMC-FeS@biochar) was prepared and tested for immobilization of hexavalent chromium Cr(VI) in soil. Results of UV-vis and transmission electron microscopy (TEM) showed that the backbone of biochar suppressed the aggregation of FeS, resulting in smaller particle size and more sorption sites than bare FeS. The composite at a dosage of 2.5 mg per gram soil displayed an enhanced Cr(VI) immobilization efficiency (a 94...
December 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29222655/levels-dietary-intake-and-health-risk-of-potentially-toxic-metals-in-vegetables-fruits-and-cereal-crops-in-pakistan
#13
Javed Nawab, Saad Farooqi, Wang Xiaoping, Sardar Khan, Asad Khan
Food safety is a major concern worldwide and human beings are frequently exposed to potentially toxic metals (PTMs) through consumption of vegetables, fruits, and cereal crops grown in contaminated areas. The present study investigates the concentrations of PTMs such as chromium (Cr), nickel (Ni), zinc (Zn), arsenic (As), cadmium (Cd), and lead (Pb) in the foodstuffs (fruits, vegetables, and cereals) collected from different markets of Khyber Pakhtunkhwa, Pakistan. Samples of fruits (banana, tangerine, apple, and guava), vegetables (tomato, onion, potato, pea, and lady finger), and cereals (rice, kidney beans, and chick peas) were acid-extracted and analyzed using ICP-MS...
December 8, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29216955/combined-toxicity-of-an-environmental-remediation-residue-magnetite-fe3o4-nanoparticles-cr-vi-adduct
#14
Zhuan Li, Miao Liu, Li Ke Chen, Guang Zhu Li
OBJECTIVE: This paper aims to elucidate the combined toxicity of magnetite nanoparticles/Chromium [MNPs/Cr(VI)] adducts. METHODS: The HEK293 cell was exposed to either Cr(VI) or MNPs, or their adducts MNPs/Cr(VI). The cytotoxicity was evaluated by assessing the cell viability, apoptosis, oxidative stress induction, and cellular uptake. RESULTS: The toxicity of formed adducts is significantly reduced when compared to Cr(VI) anions. We found that the cellular uptake of MNPs/Cr(VI) adduct was rare, only few particles were endocytosed from the extracellular fluid and not accumulated in the cell nucleus...
November 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29209943/mapping-toxic-mineral-contamination-the-southern-oyster-drill-s-haemastoma-l-1767-as-evaluable-sentinel-species
#15
Giuseppa Di Bella, Gianluca Pizzullo, Giuseppe Daniel Bua, Angela Giorgia Potortì, Antonello Santini, Salvatore Giacobbe
The nickel, chromium, arsenic, cadmium, and lead content have been evaluated, by ICP-MS, in digestive gland of the amphiatlantic gastropod Stramonita haemastoma, sampled along the highly anthropized Gulf of Milazzo (Central Mediterranean). Concentrations notably higher than those reported in literature for other Mediterranean Muricidae have been recorded. The results also indicated a different impact in different sites, according to distribution and typology of human activities, whilst recorded seasonal variations might relate with rapid metabolic response...
December 6, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29207354/biomonitoring-chromium-iii-or-vi-soluble-pollution-by-moss-chlorophyll-fluorescence
#16
Yang-Er Chen, Hao-Tian Mao, Jie Ma, Nan Wu, Chao-Ming Zhang, Yan-Qiu Su, Zhong-Wei Zhang, Ming Yuan, Huai-Yu Zhang, Xian-Yin Zeng, Shu Yuan
We systematically compared the impacts of four Cr salts (chromic chloride, chromic nitrate, potassium chromate and potassium bichromate) on physiological parameters and chlorophyll fluorescence in indigenous moss Taxiphyllum taxirameum. Among the four Cr salts, K2Cr2O7 treatment resulted in the most significant decrease in photosynthetic efficiency and antioxidant enzymes, increase in reactive oxygen species (ROS), and obvious cell death. Different form the higher plants, although hexavalent Cr(VI) salt treatments resulted in higher accumulation levels of Cr and were more toxic than Cr(III) salts, Cr(III) also induced significant changes in moss physiological parameters and chlorophyll fluorescence...
December 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29195103/chromium-zinc-ferrite-nanocomposites-for-the-catalytic-abatement-of-toxic-environmental-pollutants-under-ambient-conditions
#17
Divya S Nair, Manju Kurian
Catalytic abatement of 4-chlorophenol, 2,4-dichlorophenol and 2,4-dichlorophenoxy acetic acid in water was investigated by peroxide oxidation over chromium substituted zinc ferrite nanocomposites at ambient conditions. The structural and chemical properties of composites synthesized by sol-gel auto combustion method was studied by X-ray diffraction, Fourier Transform Infra-Red spectroscopy, Transmission Electron Microscopy, surface area, X-ray Fluorescence spectroscopy, Temperature Programmed Reduction and Desorption techniques...
November 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29189889/is-cr-iii-toxic-to-bacteria-toxicity-studies-using-bacillus-subtilis-and-escherichia-coli-as-model-organism
#18
Aafreen Fathima, Jonnalagadda Raghava Rao
The objective of this work is to detect the mode of damage caused by Cr(III), one of the widely used industrial pollutant on Bacillus subtilis-industrial strain 168 and Escherichia coli MTCC 40. Bioassays are very sensitive, precise, economical and rapid for detecting early stages of pollution. The detrimental effect of trivalent chromium becomes clear from the growth profile and growth inhibition studies. Mode of action of damage by trivalent chromium in bacterial model was found to be oxidative, as chromium is one of the redox active metals...
November 30, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/29181620/consumption-of-heavy-metal-contaminated-foods-and-associated-risks-in-bangladesh
#19
Md Isreq Hossen Real, Hossain M Azam, Nehreen Majed
This study investigated the magnitude of heavy metal contamination and determined the carcinogenic as well as non-carcinogenic risks associated with selected food consumption in Bangladesh. Commonly consumed varieties of rice, vegetables, and fish samples were analyzed to measure the concentrations of heavy metals such as cadmium, chromium, lead, arsenic, manganese, nickel, and zinc. These staple food items showed the greatest probabilities of heavy metal contamination in different phases of their production and marketing...
November 27, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29175790/in-vitro-antimicrobial-antiprotozoal-activities-and-heavy-metals-toxicity-of-different-parts-of-ballota-pseudodictamnus-l-benth
#20
Najeeb Ullah, Ijaz Ahmad, Nisar Ahmad, - Fozia
The study was done to check the antimicrobial and antiprotozoal activity of different parts of Ballota pseudodictamnus (L.) Benth. These activities were then compared with the heavy metals toxicity of different parts, which plants accumulate in different concentrations in different parts. In in-vitro antileishmanial results ethanolic extract, chloroform and ethyl acetate fractions in roots of Ballota pseudodictamnus (L.) Benth showed antileishmanial activity. The ethanol, n-butanol and ethyl acetate fraction in stem revealed inhibition of amastigote form of leishmania...
November 2017: Pakistan Journal of Pharmaceutical Sciences
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